MC33363B datasheet(4/12 Pages) ONSEMI

Part #	MC33363B

Description	HIGH VOLTAGE OFF-LINE SWITCHING REGULATOR

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Manufacturer	ONSEMI [ON Semiconductor]

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MC33363B

4

MOTOROLA ANALOG IC DEVICE DATA

0

1.0

70

1.80 V

10

100

7.0

0.8

1.0

µs/DIV

IO, OUTPUT LOAD CURRENT (mA)

TIMING RESISTOR RATIO

1.0

µs/DIV

VCC = 20 V

AV = –1.0

CL = 10 pF

TA = 25°C

f, FREQUENCY (Hz)

Figure 3. Oscillator Charge/Discharge

Current versus Timing Resistor

RT, TIMING RESISTOR (kΩ)

Figure 4. Maximum Output Duty Cycle

versus Timing Resistor Ratio

Figure 5. Error Amp Open Loop Gain and

Phase versus Frequency

Figure 6. Error Amp Output Saturation

Voltage versus Load Current

Figure 7. Error Amplifier Small Signal

Transient Response

Figure 8. Error Amplifier Large Signal

Transient Response

VCC = 20 V

AV = –1.0

CL = 10 pF

TA = 25°C

1.75 V

1.70 V

3.00 V

1.75 V

0.50 V

0.5

0.3

0.2

0.15

0.1

0.08

80

60

40

20

0

–20

60

50

40

30

–1.0

– 2.0

2.0

1.0

0

10

15

20

30

70

2.0

3.0

5.0

7.0

10

100

1.0 k

10 k

100 k

1.0 M

10 M

0.2

0.4

0.6

0.8

1.0

0

30

60

90

120

150

180

RD/RT Ratio

Discharge Resistor

Pin 6 to Gnd

VCC = 20 V

CT = 2.0 nF

TA = 25°C

RC/RT Ratio

Charge Resistor

Pin 6 to Vreg

VCC = 20 V

VO = 1.0 to 4.0 V

RL = 5.0 MΩ

CL = 2.0 pF

TA = 25°C

Gain

Phase

VCC = 20 V

TA = 25°C

Source Saturation

(Load to Ground)

Sink Saturation

(Load to Vref)

VCC = 20 V

TA = 25°C

Gnd

Vref

50

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